LOST

The adjective lost describes anything that can't be found, like your favorite pair of sunglasses that you left on a table at the library and never saw again.

Beloved hand-knit scarves can be lost, and so can wandering pet goats. A person can get lost in the unfamiliar, winding streets of a strange city. You can also describe someone as lost if they're confused or desperately in need of some kind of help. 
The origins of the word lost come from the Proto-Indo-European leu, "to loosen, untie, or separate". The meaning "to be defeated," like when you've lost a game or lost a battle, came later, around 1530.

British Dictionary definitions for lost

1. unable to be found or recovered

2. unable to find one's way or ascertain one's whereabouts

3. confused, bewildered, or helpless: he is lost in discussions of theory

4. (sometimes foll by on) not utilized, noticed, or taken advantage of (by): rational arguments are lost on her

5. no longer possessed or existing because of defeat, misfortune, or the passage of time: a lost art

6. destroyed physically: the lost platoon

7. (foll by to) no longer available or open (to)

8. (foll by to) insensible or impervious (to a sense of shame, justice, etc)

9. (foll by in) engrossed (in): he was lost in his book

10. morally fallen: a lost woman

11. damned: a lost soul

12. (usually imperative) (informal) get lost, go away and stay away

Sister Sledge - Lost in Music 1979